LiveCD/VTOY/ventoy/disksize.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4
   5 typedef unsigned long long UINT64;
   6
   7 int GetHumanReadableGBSize(UINT64 SizeBytes)
   8 {
   9     int i;
  10     int Pow2 = 1;
  11     double Delta;
  12     double GB = SizeBytes * 1.0 / 1000 / 1000 / 1000;
  13
  14     for (i = 0; i < 12; i++)
  15     {
  16         if (Pow2 > GB)
  17         {
  18             Delta = (Pow2 - GB) / Pow2;
  19         }
  20         else
  21         {
  22             Delta = (GB - Pow2) / Pow2;
  23         }
  24
  25         if (Delta < 0.05)
  26         {
  27             return Pow2;
  28         }
  29
  30         Pow2 <<= 1;
  31     }
  32
  33     return (int)GB;
  34 }
  35
  36 int main(int argc, char **argv)
  37 {
  38     UINT64 value = strtoul(argv[1], NULL, 10);
  39
  40     printf("%d", GetHumanReadableGBSize(value * 512));
  41
  42     return 0;
  43 }